Drawing-die-ring support



May 13, 1924. 1,493,642

0. G. NILSON DRAWING DIE RING SUPPORT Filed Dec. 15 1921 j ,1 I @Z Patented May 13, 1924,

UNITED STATES PATIENT oFFicE.

0L0! G. III-SON, OF OEICAGOLILLINOIS, ABSIGFOR '10 maeumn TOOL & IAJI'UFC- TUBING COIPANY. OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

' DBAWING-DIE-RING SUPPORT.

Application am Deocmber 1a, 1921. Serial ll'o. 522,514.

To all whom it mart concern:

Be it known that I, OLOF G. NhnsoN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Drawing Dle-Rlng Supports, of which the followingis a specification.

This invention relates to improvements in drawing die ring support particularly adapted. though not necessarily limited in its use for metal drawing machines.

In machines of this character the metal I while being operated upon or drawn .is

usually held by means of a draw ring, which ring must exert sufiicient pressure upon the metal to prevent it from wrinkling at the beginning of the stroke. and which pressure must not be so great as to cause the metal to tear toward the end of the stroke.

- Heretofore the-use of a resilient element or spring for yieldingly holding the draw ring has been unsatisfactory by reason of the fact that when used there would be an increase in the resistance caused by the resilient element or spring as it is compressed toward the end of the stroke, thereby increasing to an undesirable extent the gripping action of the draw ring upon the metal,

, wrinkling.

which would result in the metal tearing near the end of the stroke.

Should the tension upon the resilient element or spring be adjusted so as to prevent the metal from being torn near the end of the stroke the pressure of the draw ring would not be sufiicient at-the beginning of the stroke to prevent the material from To overcome these difiiculties and objections and to providean improved drawing die ring support of this type by means of which a. substantially constant or even pressure may be obtained throughout the entire stroke or compression upon-the work, is one of the objects of the present invention.

A further object is to provide improved cam devices which are adapted to be inter changed whereby the action of the draw ring may be controlled, that is to say so that the draw rin will act with an increased or decreased resistance toward the end of the stroke as maybe desired.

A further object is to provide an improved device of this character which will be simple, durable, cheap and compact 1n construction, adapted to be readil ap lied to a press and as readily removed t ere m.

To the attainment of these ends and the accomplishment of other new and useful objects as will appear. the invention consists in the features of novelty in substantially the construction. combination and arrangement of the several parts hereinafter more fully described and claimed and shown in the accompanying drawing illustrating this invention, and in which- Figure 1 is a view partly in vertical section, partly in side elevation, and partly broken away of a drawing die ring support of this character.

Figure 2 is a side elevation.

Figure 3 is a detail plan view taken on line 33, Figure- 2, with parts omitted.

Referring more particularly to the drawing the numeral 10 indicates the bolster plate of a press of any ordinary and well known construction, and mounted upon this plate is a (lie or forming member 11, co-operating with which die is the usual draw ring 12, between which ring and the punch 13 the material to be shaped is clamped. The punch 13 is provided with a knockout 14.

all of which parts are of the ordinary and well known construction.

The drawing die ring support which controls the gripping action of the draw ring upon the material consists essentially of a resilient element 15, which may be constructed of any suitable material such as rubber or if desired the element may be formed of an ordinary coil spring.

This element 15 is provided with an opening .16 extending longitudinally therethrough and the element is interposed between a supporting plate or element 17 and a plate or element 18. Passing through the element 15 as well as the elements 17 and 18 is a tubular member 19 which extends below the element 17 and is threaded as at 20 to receive a nut 21 and upon which nut the element 17 rests. i

The tubular member 19 is of any desired diameter and extents}? therethrou'gh is a.

2 22 is threaded as at 24 and passes through the usual opening 25 in the bed plate 10 to be screwed into the die support 26. Inter-' posed between the element 18 and the bed plate 10 is a supporting member 27 having an opening 28 therethrough, through which the upper end of the tubular element 19 passes. This opening 28 in the member 27 is provided with laterally projecting recesses 29, which communicate with the opening 28 for a purpose to be hereinafter set forth.

The tubular member 19 is provided with diametrically opposite rack teeth 30, spaced from the upper end of the member 28 so as to stand intermediate the elements 18 and 27. This tubular element 19 is also provided with a head or collar 31 on the upper end thereof, adapted to rest upon the support 27, for holding the tubular member in position. The tubular member is adapted to be passed through the support 27 by twistin the member so that the rack teeth 30 wi 1 pass through the laterally projecting recesses 29 of the opening 28, and after the teeth 30 have passed through the member 27 the tubular member'19 is .rotated to any desired extent and so as to also position the rack teeth 30. A spacing member 32 may be interposed between the head 31 of the tubular member 19 and the base 26 of the die so that when the bolt 22 is screwed into the base 26 of the die the parts will be removably and firmly secured to the bed plate 10.

The draw ring 12 is supported by means of suitable pins 33 which pass through the base 26 of the dieand through the bolster plate 10, so as to engage and rest upon the supporting member 27.

The member 18 is provided on each side of the tubular member 19 with upwardly projecting spaced portions 34 and between each pair of these projections is arranged a roller 35, the projections 34 being preferably of a size so as to extend over the teeth 30 on the tubular member 19, and thereby serveas a guide for the teeth and hold the tubular member 19 against rotation.

Depending from the support 27 and on the opposite sides of the tubular member 19 are ears or hangers 36, between each pair of which hangers a gear 37 is rotatably supported as at 38. These gears are provided with teeth 39 which mesh with the rack teeth 30, and a portion of the periphery of each of the gears is shaped to form a cam 40. The gears 37 are of such a size and are so disposed with respect to the respective rollers 35 that the cam portions of the periphery of the gears will engage and move across the respective rollers 35.

With this improved construction it will be manifest that the whole drawing die ring naeaeaa support, with the exception of the pins 33 may be removed as a unit from the press by unscrewing the bolt 22 and likewise may be applied as a unit by anchoring the bolt 22. Obviously by adjusting the nut 21 the tension of the resilient element 15 may be varied.

In operation and when the parts are in the position as shown in Figure 1, the material to be shaped is placed upon the drawing ring 12 and as the punch 13 descends the material will be gripped between the punch 13 and the drawing ring 12. Upon a further movement of the punch in a downward direction the drawing ring 12 will be depressed and the material will be shaped over the forming die 11. As the drawing ring 12 is depressed the support 27 will, through the medium of the pins 33, be also depressed to cause the cam gears 37 to be moved bodily downward and as the periphery of the cam gears are in contact with the rollers 35, the latter being mounted upon the support 18, the support 18 being itself supported by the resilient element 15, a further depression of the draw ring tends to compress the resilient element 15. As the cam gears 37 are thus bodily depressed they will be rotated about their pivots 38 by reason of the fact that the teeth 39 of the gears are in mesh with the stationary rack teeth 30, with the result that the supports 27 and 18 will be moved in the same direction at different rates of speed. The stress of the resilient member 15 is always exerted upon the cams 37 through the medium of the element 18, and the rollers 35, and as the cams are moved about their pivots 38 the low portions of the cams will be moved into contact with the rollers 35. The stress of the resilient element 15 being exerted upon the cam gears 37 will cause the teeth 39 to exert an upward or pulling action uponthe teeth 30. This result is accomplished because as shown in Figure 1 the centers of the pivot 38 of the cams 37 are in alinement with the centers of rotation of the rollers 35 as the cams begin to move bodily downward, but, as the low portions of the cams move into contact with the rollers the cams will exert a stress on the rollers to one side of the pivots of the respective rollers, that is on the inside thereof, and this action of the cams upon the rollers compensates the tension exerted upon the resilient element 15. As the drawing ring 12 is moved upwardly by the stress of the resilient element 15, when the punch 13 recedes, the cam gears will be moved in the opposite direction by reason of the intermeshing teeth 3930. It will therefore be seen that the cam gears 37, during the operation of the machine will be given an oscillatory movement about their pivots. During this oscillating movement the cam portion 40 of the periphery of the gears 37 by V aaeaeea their movement in contact with the rollers 35 will so act upon the resilient element as to cause a substantially uniform or unvarying pressure of the drawing ring 12 upon the material gripped thereby.

It will therefore be seen that with the present construction there is provided a self-contained drawing die support ,which may be readily applied to any press .tion the device will retain the pressure to which it has been adjusted, whether the drawing die ring support is applied to the press or detached therefrom. i

It will also be manifest that the cam gears 37 are rem'ovably supported in position by reason of the fact that thefpivots 38 are removably secured in position by means of suitable fastening devices 41, so' that these cam gears may be removed d other cam gears substituted therefor, aving different shaped cam portions, thereby rendering it possible to adapt this device for use so as to obtain either an increased or decreased resistance toward the end of the stroke,.as may be desired, and in accordance with the specific shaped cam gear to be employed.

While the preferred form of the invention has been herein shown and described it is to be understdod that various changes ma be made in the details of construction, an in the combination and arrangement of the several parts, within the scope of the claims, without departing from the spirit of this invention.

What is claimed as new is 1. A drawing die ring support embodying a member adapted to be attached to a stationary part of a press, a movable member operatively related to the drawing ring, and resilient means for asserting a substantially unvarying pressure upon the drawing'ring throughout the movement of the said movable member, the said means embodying co-operating toothed members one of which is actuated by the other.

2. A drawing die ring support embodying a member adapted to be attached to a stationary part of a press, a movable member operatively. related to the drawing ring, and means for asserting a substantially unvarying pressure upon the drawing ring throughout the movement of the said movable member, the said means embodying cooperating toothed members, one of the toothed members being stationary and the other toothed member being adapted for a bodily movement. and also a pivotal move ment with respect to the co-operating toothed member during such bodily movement. 3. A drawing die ring support embodylng a movable member, a stationary member, resilient means interposed between the members for yieldinglyresisting the movement of the movable member, and means interposed between the said movable member and the said resilient means for controlling the action ofthe latter, the second recited means embodying a toothed cam element and means for actuating the cam element.

4. A drawing die ring support embodying a movable member, a stationary member, resilient means interposed between the members for yieldingly resisting the movement of-the movable member, and means interposed between the said movable member and the said resilient means for controlling the action of the latter, the second recited means embodying intermeshing toothed elements, one of said elements being stationary. the other element being shiftable by the stationary element, a portion of the said shiftable element'being shaped to form a cam surface.

5;. A device of the character described embodying blank holding members, resilient means for, yieldingly resisting the movement of said members, a cam. device interposed between the said members. said cam device being movable with and with respect to the members, the said cam device being connected with one of the members and operable upon the, other of the said members for controlling the action of the said resilient means, and means for rendering the cam device active with respect to the said other member.

6. A drawing die ring support embodypivotally mounted cam device interposed between the said member and the said resiliend means, said cam device being connected with the member formovement therewith and with respect thereto and being operable upon the said resilient means, and means opcrating automatically to cause the cam device to be moved with respect to its support .for influencing the said resilient means.

8. A drawing die ring support embodying a movable member, resilient means for yielding resisting movement of said member, a pivotally mounted cam device interposed between the said member and the said resilient means, said cam device being connected with the member for movement: therewith and with respect thereto and. being operable upon the said resilient means, and means operating automatically to cause. the cam device to be moved with respect to its support whereby the resistance to movement of the said member may be caused to be substantially unvarying during the stroke of the said member.

9. A drawing die ring support embodying a movable member. resilient means for yielding resisting movement of said member, a pivotally mounted cam device interposed between the said member and the said resilient. means, said cam device. being connected with the member for movement therewith and with respect thereto and being operable upon the said resilient means, and means embodying a stationary element and intermeshingportions between the stationary element and the said cam device for moving the am device with respect to its support for influencing the said resilient means.

10. A drawing die ring support embodying a movable member, resilient means for yielding resisting movement of said member, a pivotally mounted cam device interposed between the said member and the said resilient means, said cam device being connected with the men'iber for movement therewith and with respect thereto and being operable upon the said resilient means, and means responsive to the movement of the cam device with the said member for moving the cam device with respect to its support for influencing the said resilient means.

11. A drawing die. ring support embodying a movable member, resilient means for yieldingly resisting movement of said member, a pivotally mounted cam device interposed between the said member and the said resilient means, said cam device being connected with the member for movement therewith and with respect thereto andbeing operable upon the said resilient means, means operating automatically to cause the cam device to be moved with respect to its support for influencing the said resilient means, and adjustable means for varying the tension of the said resilient means.

12. As a unitary structure a drawing die ring support embodying a movable member,

- resilient means for yielding resisting movement of said member, a pivotally mounted .cam device interposed between the said memberand the said resilient means, said cam device being supported by the member for movement therewith and with respect messes thereto and being operable upon the said resilient means, means operating automatically to cause the cam device to be moved with respect to its support for influencing the said resilient means, and a single fastening means for securing the parts to a press.

13. As a unitary structure a drawing die ring support embodying a movable member, resilient means for yielding resisting movement of said member a pivotally mounted cam device interposed between the said member and the said resilient means, said cam device being supported by the member for movement therewith and with respect thereto and being operable upon the said resilient means, means operating automatically to cause the cam device to be moved with respect to its support for influencing the said resilient means, a single fastening means for securing the parts to a press, and means whereby the tension of the said resilient means may be variedat will.

14. A drawing die ring support embodying a stationary member, spaced movable members, resilient means interposed between the stationary member and the movable members for yieldingly resisting movement of the latter, a cam device supported by one of the movable members for movement therewith and with respect thereto, a roller carried by the other movable member and against which roller the cam operates, teeth on the cam device, and a stationary rack with which the cam teeth engage Whereby the cam will be shifted with respect to its support for influencing the said resilient means and during the movement of the cam with its support.

15. A drawing die ring support embodying a stationary member, spaced movable members, resilient means interposed between the stationary member and the movablemembers for yieldingly resisting movement of the latter, a cam device supported by one of the movable members for movement therewith and with respect thereto, a roller carried by the other movable member and against which roller the cam operates, teeth on the cam device, a stationary rack with which the cam teeth engage whereby the cam will be shifted with respect. to its support for influencing the said resilient means and during the movement of the, cam with its support, one of the movable members having an irregular opening through which the rack may be passed and then twisted axially to position the rack, and means for holding the rack in its twisted position.

In testimony whereof I have signed my name to this specification on this 12th day of December, A. D. 1921.

OLOF G. NILSON. 

